CN114725417A - Continuous preparation method and equipment of graphite bipolar plate - Google Patents
Continuous preparation method and equipment of graphite bipolar plate Download PDFInfo
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- CN114725417A CN114725417A CN202210355867.3A CN202210355867A CN114725417A CN 114725417 A CN114725417 A CN 114725417A CN 202210355867 A CN202210355867 A CN 202210355867A CN 114725417 A CN114725417 A CN 114725417A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 209
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 208
- 239000010439 graphite Substances 0.000 title claims abstract description 208
- 238000002360 preparation method Methods 0.000 title claims abstract description 39
- 238000007598 dipping method Methods 0.000 claims abstract description 49
- 238000001035 drying Methods 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000004140 cleaning Methods 0.000 claims abstract description 44
- 239000000178 monomer Substances 0.000 claims abstract description 44
- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 238000007731 hot pressing Methods 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 239000007770 graphite material Substances 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 75
- 238000005470 impregnation Methods 0.000 claims description 36
- 238000003825 pressing Methods 0.000 claims description 13
- 238000010924 continuous production Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 8
- 238000000748 compression moulding Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000009738 saturating Methods 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002109 single walled nanotube Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0213—Gas-impermeable carbon-containing materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
- B30B3/04—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs co-operating with one another, e.g. with co-operating cones
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0221—Organic resins; Organic polymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0226—Composites in the form of mixtures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Sustainable Energy (AREA)
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- Manufacturing & Machinery (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The application discloses graphite bipolar plate serialization preparation method and equipment, and the preparation method uses expanded graphite material feed bin, roll-in forming device, guillootine, saturating device, continuous drying cabinet and hot press, and its step includes: s1, adding raw materials into an expanded graphite material bin to prepare a graphite bipolar plate base material; s2, carrying out continuous compression molding on the graphite bipolar plate base material through a rolling molding device to obtain a graphite bipolar plate blank; s3, cutting the graphite bipolar plate blank through a cutting machine to obtain a graphite bipolar plate blank monomer; s4, conveying the graphite bipolar plate monomer into a dipping device, putting the dipping device into a dipping solution for continuous dipping, and then cleaning; s5, conveying the cleaned graphite bipolar plate monomer into a continuous drying box for drying and curing; and S6, conveying the graphite bipolar plate monomer subjected to drying and curing treatment into a hot press for continuous hot pressing to obtain the graphite bipolar plate. The method realizes continuous and efficient production, has simple process and excellent product strength, and is suitable for large-scale mass production.
Description
Technical Field
The invention relates to the technical field of graphite bipolar plate manufacturing, in particular to a continuous preparation method and continuous preparation equipment of a graphite bipolar plate.
Background
The fuel cell is an innovative technology of replacing traditional energy with novel energy, and the working principle of the fuel cell is that hydrogen and oxygen respectively react at a cathode and an anode to generate electrons. The fuel cell is formed by stacking a bipolar plate and a membrane electrode, wherein the bipolar plate plays roles in transmitting gas, conducting electrons, supporting a structure and the like, the volume of the bipolar plate accounts for 60 percent of the volume of the cell, and the cost of the bipolar plate accounts for about 30 percent of the volume of the cell. The bipolar plates are currently classified into metal bipolar plates, graphite bipolar plates, and composite bipolar plates according to the difference of materials.
The graphite bipolar plate has good corrosion resistance and electrical conductivity, so the graphite bipolar plate is widely applied to the field of fuel cells. The manufacturing process of the graphite plate at present mainly comprises the following steps: firstly, machining by a machine tool, and adding a bipolar plate flow field structure by the machine tool, so that the machine tool is high in cost, low in efficiency and not suitable for large-scale commercial mass production; and secondly, compression molding, namely mixing the resin and the graphite plate in a mold for hot-pressing molding, wherein the processed graphite bipolar plate has poor strength and high resistivity, and is not beneficial to research and development of a high-performance graphite plate.
Therefore, how to improve the preparation efficiency and the finished product quality of the graphite bipolar plate and mass-produce the graphite bipolar plate on a large scale needs to be solved urgently.
Disclosure of Invention
In order to solve the technical problems explained in the background art, a first objective of the present application is to provide a continuous preparation method of a graphite bipolar plate, wherein the graphite bipolar plate is formed by rolling, so that automatic continuous production can be realized, the production efficiency is high, the process is simple, the product strength is excellent, and the method is suitable for large-scale mass production.
The second purpose of the application is to provide continuous preparation equipment of the graphite bipolar plate, which can be matched with a continuous preparation method of the graphite bipolar plate, so that continuous production is realized, and the problem that more stockpiles are avoided due to the fact that the impregnation process needs to be suspended due to long time consumption is solved.
In order to achieve the first object, the method for continuously preparing the graphite bipolar plate uses an expanded graphite material bin, a rolling forming device, a cutting machine, an impregnation device, a continuous drying box and a hot press, and comprises the following steps:
s1, adding raw materials into the expanded graphite material bin to prepare a graphite bipolar plate base material;
s2, continuously pressing and forming the graphite bipolar plate base material through the rolling forming device to obtain a graphite bipolar plate blank;
s3, cutting the graphite bipolar plate blank through the cutting machine to obtain a graphite bipolar plate blank monomer;
s4, conveying the graphite bipolar plate monomer into the dipping device, putting the dipping device into a dipping solution for continuous dipping, and then cleaning;
s5, conveying the cleaned graphite bipolar plate monomer into the continuous drying box for drying and curing;
and S6, conveying the graphite bipolar plate monomer subjected to drying and curing treatment into the hot press for continuous hot pressing to obtain the graphite bipolar plate.
As an implementation manner of the continuous preparation method of the graphite bipolar plate, in S2, the roll-forming device includes a pre-press roll, the graphite bipolar plate base material passes through the pre-press roll to form a flexible graphite roll, the pre-press pressure of the pre-press roll is 0.5-1 MPa, and the thickness of the flexible graphite roll is 0.5-6 mm.
As an implementation mode of the continuous preparation method of the graphite bipolar plate, in S4, the dipping time is 60-70 mins, and the cleaning time is 10-15 mins.
As an implementation mode of the continuous preparation method of the graphite bipolar plate, in S5, the drying and curing temperature is 120 ℃, and the drying and curing time is 30-40 mins.
In order to achieve the second purpose, the continuous preparation equipment for the graphite bipolar plate comprises a circulating conveying line, wherein the circulating conveying line sequentially passes through an expanded graphite material bin, a rolling forming device, a cutting machine, an impregnation device, a continuous drying box and a hot press; the expanded graphite material bin is provided with a feeding hole and a discharging hole, and the discharging hole is positioned above the circulating conveying line; the roll forming device comprises a roll forming die, the roll forming die is provided with a groove, and the circulating material conveying line penetrates through the roll forming device; the cutting machine is provided with a cutting knife which is positioned above the circulating material conveying line; the dipping device comprises a conveyor, a buffer mechanism, a dipping mechanism and a cleaning mechanism which are sequentially arranged, wherein the conveyor conveys the graphite bipolar plates on the circulating conveying line to the buffer mechanism, the buffer mechanism can accommodate a plurality of graphite bipolar plates, and the dipping device also comprises a clamping mechanism which is used for clamping and conveying the graphite bipolar plates; the continuous drying box is in a tunnel type, and the circulating material conveying line penetrates through the continuous drying box; the hot press is used for shaping the graphite bipolar plate.
As an implementation mode of continuous preparation equipment of the graphite bipolar plate, the rolling forming die comprises a buoyancy roller set and a forming roller set, and the circulating material conveying line penetrates through the buoyancy roller set and the forming roller set; the buoyancy roller set is provided with a spring support, so that the buoyancy roller set can float up and down relative to the circular conveying line; the forming roller group is provided with a driving piece, the driving piece drives the forming roller group to move up and down relative to the circulating material conveying line, and the moving distance of the forming roller group is adjusted based on the floating distance of the buoyancy roller group.
As an implementation mode of continuous preparation equipment of the graphite bipolar plate, the conveyor is provided with a detection piece, the buffer mechanism comprises a buffer wheel disc, a plurality of buffer seats and balance balls, the buffer wheel disc rotates around the circumferential direction, the buffer seats are hinged with the buffer wheel disc, the buffer seats are distributed around the circumferential direction of the buffer wheel disc, and the balance balls are fastened with the buffer seats; the buffer mechanism is positioned in a buffer pool, and dipping solution is arranged in the buffer pool.
As an implementation mode of continuous preparation equipment of the graphite bipolar plate, the impregnation mechanism is provided with an impregnation cavity and a plurality of first partition plates, and the first partition plates divide the impregnation cavity into a plurality of impregnation stations; the cleaning mechanism is provided with a cleaning cavity and a plurality of second partition plates, and the second partition plates divide the cleaning cavity into a plurality of cleaning stations; the clamping mechanism is located above the buffer pool, the dipping mechanism and the cleaning mechanism.
As an implementation mode of the continuous preparation equipment of the graphite bipolar plate, a waste treatment mechanism is arranged between the dipping mechanism and the cleaning mechanism and is used for treating the graphite bipolar plate which does not meet the detection condition of the detection piece.
As an implementation mode of the continuous preparation equipment of the graphite bipolar plate, the roll forming device further comprises a pre-pressing roller and a guide roller, the pre-pressing roller and the guide roller are positioned in front of the roll forming die, the pre-pressing roller preliminarily levels the graphite bipolar plate, and the guide roller pulls the graphite bipolar plate into the roll forming die.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a process flow line of an exemplary embodiment of a method for continuous production of a graphite bipolar plate;
FIG. 2 is a process flow line of an exemplary embodiment of a method for continuous production of a graphite bipolar plate;
FIG. 3 is a partial schematic structural view of a roll forming die in an exemplary embodiment of a continuous production apparatus for a graphite bipolar plate;
FIG. 4 is a schematic view showing the structure of an impregnation device in an exemplary embodiment of a continuous production apparatus for a graphite bipolar plate;
FIG. 5 is a schematic view showing the structure of an impregnation mechanism in an exemplary embodiment of a continuous production apparatus for a graphite bipolar plate;
FIG. 6 is a schematic view showing the structure of a cleaning mechanism in an exemplary embodiment of a continuous production apparatus for a graphite bipolar plate;
description of the reference numerals:
the direction of the arrows in fig. 1, 2, 3 and 4 is the conveying direction;
1. a circulating material conveying line;
2. an expanded graphite material bin;
3. a roll forming device; 31. rolling a forming die; 311. a buoyancy roller set; 312. forming a roller set; 313. a spring support; 314. a drive member; 32. pre-pressing rollers; 33. a guide roller;
4. a cutting machine;
5. an impregnation device; 51. a conveyor; 52. a buffer mechanism; 521. a buffer wheel disc; 522. a buffer seat; 523. a balance ball; 53. a dipping mechanism; 531. a dipping chamber; 532. a first separator; 54. a cleaning mechanism; 541. a cleaning chamber; 542. a second separator; 55. a clamping mechanism;
6. a continuous drying oven;
7. a hot press;
8. a disposal means.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical elements.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As a specific implementation manner of the continuous preparation method of the graphite bipolar plate, the continuous preparation method of the graphite bipolar plate uses an expanded graphite material bin 2, a roll forming device 3, a cutting machine 4, an impregnation device 5, a continuous drying box 6 and a hot press 7, and specifically, the continuous preparation method of the graphite bipolar plate comprises the following steps:
s1, adding raw materials into an expanded graphite material bin 2 to prepare a graphite bipolar plate base material; in a specific embodiment, the raw material is one or more of carbon fiber, conductive graphite felt, single-walled carbon nanotube and graphene; in one particular embodiment, the faces of the graphite bipolar plate substrateThe density is 30-350 mg/cm2；
S2, carrying out continuous compression molding on the graphite bipolar plate base material through a rolling molding device 3 to obtain a graphite bipolar plate blank; in a specific embodiment, the roll forming device 3 includes a pre-pressing roller 32, the graphite bipolar plate base material passes through the pre-pressing roller 32 to form a flexible graphite roll, the pre-pressing pressure of the pre-pressing roller 32 is 0.5-1 MPa, the thickness of the flexible graphite roll is 0.5 mm-6 mm, the flexible graphite roll is a light plate of an unprocessed flow field area and a non-flow field area, the flexible graphite roll is subjected to roll forming with the pressure of 5.5-6.5 MPa, and a flow field area and the rest of non-flow field areas are processed to obtain a graphite bipolar plate blank;
s3, cutting the graphite bipolar plate blank through a cutting machine 4, and cutting the graphite plate double-click plate blank into individual graphite bipolar plate blank monomers; in a specific embodiment, the outer contour dimension of the graphite bipolar plate blank monomer is 5000mm × 1000 mm;
s4, conveying the graphite bipolar plate monomer into a dipping device 5, putting the graphite bipolar plate monomer into a dipping solution for continuous dipping, and then cleaning; in a specific embodiment, the dipping time is 60-70 mins, and the cleaning time is 10-15 mins; in a specific embodiment, the impregnation solution is one or two of an epoxy resin solution and an acrylic resin;
the continuous impregnation is a process of continuously impregnating graphite with synthetic resin to fill the surface and internal pores of the graphite, mainly aims to obtain a high-density graphite bipolar plate, and can also change other properties of the graphite bipolar plate, such as resistivity, true porosity, compressive strength, bending strength, tensile strength, service life, thermal conductivity, wear resistance and corrosion resistance;
s5, conveying the cleaned graphite bipolar plate monomer into a continuous drying box 6 for drying and curing; in a specific embodiment, the temperature of the drying and curing environment is 120 ℃, and the drying and curing time is 30-40 mins;
s6, conveying the graphite bipolar plate monomer subjected to drying and curing treatment into a hot press 7 for continuous hot pressing to obtain a graphite bipolar plate; in a specific embodiment, the environment temperature of hot pressing is 120 ℃, the pressure of hot pressing is 0.5MPa, and the hot pressing time is 15 mins; in a specific embodiment, after hot pressing, the graphite bipolar plate is cut again, so that the outline deformation caused in the processes of dipping, cleaning, drying, curing and hot pressing is reduced, and the graphite bipolar plate with the standard size can be obtained.
Specifically, in combination with the above technical contents, two embodiments of the continuous preparation method of the graphite bipolar plate are provided:
the first embodiment is as follows:
adding raw materials into an expanded graphite material bin 2 to prepare a graphite bipolar plate base material, wherein the surface density of the graphite bipolar plate base material is 65mg/cm2(ii) a Conveying the base material of the graphite bipolar plate to a prepressing roller 32 through a circulating material conveying line 1 for prepressing, wherein the prepressing pressure is 0.5MPa, so as to obtain a flexible graphite roll, then drawing the flexible graphite roll to a roll forming position for roll forming, wherein the roll forming pressure is 5.5MPa, and processing an effluent field region and other non-flow field regions, so as to obtain a graphite bipolar plate blank; conveying the graphite bipolar plate blank to a cutting machine 4, cutting the graphite bipolar plate blank into a sample plate with the outer contour dimension of 5000mm multiplied by 1000mm, and obtaining single graphite bipolar plate blank monomers; then, conveying the graphite bipolar plate blank monomer into an impregnation device 5 for impregnation and cleaning, wherein the impregnation solution is an epoxy resin solution, the impregnation time is 60mins, and the cleaning time is 10 mins; after cleaning, sending the graphite bipolar plate blank monomer into a continuous drying oven 6 for drying and curing, wherein the temperature of a drying and curing environment is 120 ℃, and the drying and curing time is 30 mins; and (3) sending the graphite bipolar plate blank monomer which is dried and solidified into a hot press 7 for hot pressing, wherein the environment temperature of the hot pressing is 120 ℃, the pressure of the hot pressing is 0.5MPa, the hot pressing time is 15mins, obtaining the graphite bipolar plate, and then cutting again to obtain the graphite bipolar plate with the standard size.
Example two:
adding raw materials into an expanded graphite material bin 2 to prepare a graphite bipolar plate base material, wherein the surface density of the graphite bipolar plate base material is 75mg/cm2(ii) a Conveying the graphite bipolar plate base material to a prepressing roller 32 through a circulating material conveying line 1 for prepressing, wherein the prepressing pressure is 0.5MPa, obtaining a flexible graphite roll, and then, flexibly conveying the flexible graphite rollDrawing the graphite roll to a roll forming position for roll forming, wherein the pressure of the roll forming is 6.5MPa, and processing an effluent field region and other non-flow field regions to obtain a graphite bipolar plate blank; conveying the graphite bipolar plate blank to a cutting machine 4, cutting the graphite bipolar plate blank into a sample plate with the outer contour dimension of 5000mm multiplied by 1000mm, and obtaining single graphite bipolar plate blank monomers; then, conveying the graphite bipolar plate blank monomer into an impregnation device 5 for impregnation and cleaning, wherein the impregnation solution is an epoxy resin solution, the impregnation time is 60mins, and the cleaning time is 10 mins; after cleaning, sending the graphite bipolar plate blank monomer into a continuous drying oven 6 for drying and curing, wherein the temperature of a drying and curing environment is 120 ℃, and the drying and curing time is 30 mins; and (3) conveying the dried and cured graphite bipolar plate blank monomer into a hot press 7 for hot pressing, wherein the hot pressing environment temperature is 120 ℃, the hot pressing pressure is 0.5MPa, the hot pressing duration is 18mins, obtaining the graphite bipolar plate, and then cutting again to obtain the graphite bipolar plate with the standard size.
Comparing the product obtained by the first embodiment and the second embodiment with the product obtained by the existing graphite bipolar plate preparation method, wherein the product obtained by the existing graphite bipolar plate preparation method is a comparative product, and the comparison table of the product performance is as follows:
| physical Properties | Example A product | EXAMPLE two products | Comparative product |
| Polar plate thickness range (mm) | 0.06 | 0.05 | 0.1 |
| Bending strength (MPa) | 34 | 38 | 30 |
| Tensile Strength (MPa) | 28 | 30 | 24 |
| Conductivity (S/cm) | 450 | 500 | 400 |
TABLE 1 comparison of product Properties of the products of example one, example two and comparative example
As can be seen from the above table, the products obtained by the continuous production method for a graphite bipolar plate according to examples one and two have better physical properties than the comparative example.
Referring to fig. 1 to 6, the application also provides continuous preparation equipment for a graphite bipolar plate, which comprises a circulating material conveying line 1, wherein the circulating material conveying line 1 sequentially passes through an expanded graphite material bin 2, a rolling forming device 3, a cutting machine 4, an impregnation device 5, a continuous drying box 6 and a hot press 7; wherein, the expanded graphite material bin 2 is provided with a feed inlet and a discharge outlet, and the discharge outlet is positioned above the circulating material conveying line 1; the roll forming device 3 comprises a roll forming die 31, the roll forming die 31 is provided with a groove, and the circulating material conveying line 1 penetrates through the roll forming device 3; the cutting machine 4 is provided with a cutting knife which is positioned above the circulating material conveying line 1; the dipping device 5 comprises a conveyor 51, a buffer mechanism 52, a dipping mechanism 53 and a cleaning mechanism 54 which are sequentially arranged, wherein the conveyor 51 conveys the graphite bipolar plates on the circular conveying line 1 to the buffer mechanism 52, the buffer mechanism 52 can accommodate a plurality of graphite bipolar plates, the dipping device 5 further comprises a clamping mechanism 55, and the clamping mechanism 55 is used for clamping and conveying the graphite bipolar plates; the continuous drying box 6 is in a tunnel type, and the circulating material conveying line 1 penetrates through the continuous drying box 6; the hot press 7 is used for shaping the graphite bipolar plate.
In the continuous preparation equipment of the graphite bipolar plate, raw materials firstly enter an expanded graphite material bin 2, are mixed to prepare a graphite bipolar plate base material, and are extruded from a discharge port of the expanded graphite material bin 2 to a circulating material conveying line 1; then, the graphite bipolar plate base stock is conveyed to a rolling forming device 3, and is subjected to rolling forming by a rolling forming die 31, the graphite bipolar plate base stock forms a graphite bipolar plate blank, and a flow field region and a non-flow field region are processed; then, the graphite bipolar plate blanks are conveyed to a cutting machine 4 for cutting, the outline size is unified, and single graphite bipolar plate blank monomers are formed; then, the graphite bipolar plate blank monomer is conveyed to the dipping device 5 for dipping and cleaning, firstly, the graphite bipolar plate blank monomer is conveyed to the conveyor 51 from the circulating material conveying line 1, the clamping mechanism 55 clamps the graphite bipolar plate blank monomer to the buffer mechanism 52, the buffer mechanism 52 can contain a plurality of graphite bipolar plate blank monomers, the clamping mechanism 55 conveys the graphite bipolar plate blank monomer from the buffer mechanism 52 to the dipping mechanism 53, the dipped graphite bipolar plate blank monomer can also be conveyed to the cleaning mechanism 54, and the cleaned graphite bipolar plate blank monomer is conveyed to the circulating material conveying line 1 by the clamping mechanism 55; then, conveying the cleaned graphite bipolar plate blank monomer to a continuous drying oven 6 for drying and curing; and (3) conveying the graphite bipolar plate blank monomer subjected to drying and curing treatment to a hot press 7 for hot pressing and leveling to obtain the graphite bipolar plate.
The dipping time of the dipping mechanism 53 is usually 60-70 mins, the cleaning time of the cleaning mechanism 54 is usually 10-15 mins, so that a large number of graphite bipolar plate blank monomers can be waited to enter the dipping mechanism 53 on a production line, the production efficiency of continuous production of the graphite bipolar plates can be seriously influenced, the number of the simple dipping mechanisms 53 is increased to cause the linear increase of equipment investment cost, and therefore, the buffer mechanism 52 capable of accommodating a plurality of double-hit plate blank monomers is added, the double-hit plate blank monomers can be orderly and separately stored before entering the dipping mechanism 53, the normal production before dipping is not influenced, the production efficiency is improved, and the equipment cost pressure of the dipping mechanism 53 can be reduced.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, the length of the continuous drying box 6 is designed according to the size of a graphite bipolar plate blank monomer and the moving speed of the circulating material conveying line 1, and can be 5-50 m.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, the length of the hot press 7 is designed according to the size of a graphite bipolar plate blank monomer and the moving speed of the circulating material conveying line 1, and can be 1-5 m, so that continuous hot pressing is realized.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, after the graphite bipolar plate blank monomer is subjected to hot pressing, the graphite bipolar plate blank monomer can be cut once again to reduce the profile deformation caused in the processes of dipping, cleaning, drying, curing and hot pressing, so that the graphite bipolar plate with the standard size is obtained.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, the rolling forming die 31 comprises a buoyancy roller set 311 and a forming roller set 312, and the circulating material conveying line 1 passes through the buoyancy roller set 311 and the forming roller set 312; the buoyancy roller set 311 is provided with a spring support 313, so that the buoyancy roller set 311 can float up and down relative to the endless conveyor line 1; the forming roller group 312 is provided with a driver 314, the driver 314 drives the forming roller group 312 to move up and down with respect to the endless carrier line 1, and the moving distance of the forming roller group 312 is adjusted based on the floating distance of the buoyancy roller group 311. According to the compression amount of the spring support part 313 of the buoyancy roller set 311, the thickness of the graphite bipolar plate after the rolling forming of the buoyancy roller set 311 can be determined, the moving distance of the forming roller set 312 can be calculated based on the compression amount of the spring support part 313, therefore, the buoyancy roller set 311 preliminarily controls the thickness of the graphite bipolar plate, then the distance automatic adjustment is carried out through the forming roller set 312, the difference between the thickness of the graphite bipolar plate after preliminary control and the standard thickness is reduced, the rolling forming is carried out twice, the consistency of the thickness of the graphite bipolar plate can be improved, the forming accuracy is improved, and the deformation can be reduced.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, the conveyor 51 is provided with a detection piece, the buffer mechanism 52 comprises a buffer wheel disc 521, a plurality of buffer seats 522 and balance balls 523, the buffer wheel disc 521 rotates around the circumferential direction, the buffer seats 522 are hinged with the buffer wheel disc 521, the buffer seats 522 are distributed around the circumference of the buffer wheel disc 521, and the balance balls 523 are connected with the buffer seats 522 in a fastening manner; the buffer mechanism 52 is located in a buffer tank with an impregnating solution. The test piece can be used for testing the weight of the graphite bipolar plate. Buffer wheel disc 521 can carry out the rotation, and buffer seat 522 is articulated with buffer wheel disc 521, and ball balancer 523 is tied up with buffer seat 522 for buffer seat 522 holds graphite bipolar plate's one side and keeps upwards always, and balanced buffer seat 522 prevents that graphite bipolar plate from dropping. The total mass of the balance balls 523 can be far greater than the weight of the graphite bipolar plate, so that the overall balance of the buffer seat 522 cannot be affected by the placement position of the graphite bipolar plate.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, a buffer area where the buffer wheel disc 521 is located is filled with the impregnation solution, so that the graphite bipolar plate can be subjected to primary continuous impregnation in the buffer area, the impregnation time of the graphite bipolar plate entering the impregnation mechanism 53 is reduced, and the production efficiency is improved.
In a specific embodiment of the continuous preparation equipment for the graphite bipolar plate, the impregnation mechanism 53 is provided with an impregnation chamber 531 and a plurality of first partition plates 532, and the impregnation chamber 531 is divided into a plurality of impregnation stations by the first partition plates 532; the cleaning mechanism 54 is provided with a cleaning cavity 541 and a plurality of second partition plates 542, and the cleaning cavity 541 is divided into a plurality of cleaning stations by the second partition plates 542; the holding mechanism 55 is located above the buffer tank, the dipping mechanism 53, and the washing mechanism 54. Thus, the dipping mechanism 53 and the cleaning mechanism 54 can respectively dip and clean a plurality of graphite bipolar plates at one time, thereby improving the production efficiency.
In a specific embodiment of the continuous preparation device for the graphite bipolar plate, a waste treatment mechanism 8 is arranged between the dipping mechanism 53 and the cleaning mechanism 54 and is used for treating the graphite bipolar plate which does not meet the detection condition of the detection piece. Therefore, the graphite bipolar plate which does not accord with the detection condition of the detection piece can be clamped by the direct clamping mechanism 55 and is transported to the abandonment treatment mechanism 8 for abandonment treatment, and does not need to be soaked, cleaned, dried, cured and hot-pressed, so that the soaking cost and the treatment cost of subsequent cleaning, dried, cured and hot-pressed can be saved, and the qualification rate of products is improved.
In a specific embodiment of a continuous manufacturing apparatus for a graphite bipolar plate, the roll forming device 3 further includes a pre-pressing roller 32 and a guiding roller 33, the pre-pressing roller 32 and the guiding roller 33 are located in front of the roll forming mold 31, the pre-pressing roller 32 primarily levels the graphite bipolar plate, and the guiding roller 33 pulls the graphite bipolar plate into the roll forming mold 31. Thus, the deformation of the graphite bipolar plate is further reduced by multiple rolling. The curved surfaces of the pre-press roll 32 and the guide roll 33 are non-grooved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present invention, and are not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A continuous preparation method of a graphite bipolar plate is characterized in that an expanded graphite material bin, a rolling forming device, a cutting machine, an impregnation device, a continuous drying box and a hot press are used, and comprises the following steps:
s1, adding raw materials into the expanded graphite material bin to prepare a graphite bipolar plate base material;
s2, continuously pressing and forming the graphite bipolar plate base material through the rolling forming device to obtain a graphite bipolar plate blank;
s3, cutting the graphite bipolar plate blank through the cutting machine to obtain a graphite bipolar plate blank monomer;
s4, conveying the graphite bipolar plate monomer into the dipping device, putting the graphite bipolar plate monomer into a dipping solution for continuous dipping, and then cleaning;
s5, conveying the cleaned graphite bipolar plate monomer into the continuous drying box for drying and curing;
and S6, conveying the graphite bipolar plate monomer subjected to drying and curing treatment into the hot press for continuous hot pressing to obtain the graphite bipolar plate.
2. The continuous manufacturing method of a graphite bipolar plate according to claim 1, wherein in S2, the roll forming device comprises a pre-press roll, the graphite bipolar plate base material passes through the pre-press roll to form a flexible graphite roll, the pre-press roll has a pre-press pressure of 0.5 to 1MPa, and the flexible graphite roll has a thickness of 0.5mm to 6 mm.
3. The continuous preparation method of the graphite bipolar plate as claimed in claim 1, wherein the dipping time and the cleaning time in S4 are 60-70 mins and 10-15 mins respectively.
4. The method of claim 1, wherein the temperature for drying and curing is 120 ℃ and the time for drying and curing is 30-40 mins in S5.
5. The continuous preparation equipment for the graphite bipolar plate is characterized by comprising a circulating material conveying line, wherein the circulating material conveying line sequentially passes through an expanded graphite material bin, a rolling forming device, a cutting machine, an impregnation device, a continuous drying box and a hot press; wherein,
the expanded graphite material bin is provided with a feeding hole and a discharging hole, and the discharging hole is positioned above the circulating material conveying line;
the roll forming device comprises a roll forming die, the roll forming die is provided with a groove, and the circulating material conveying line penetrates through the roll forming device;
the cutting machine is provided with a cutting knife which is positioned above the circulating material conveying line;
the dipping device comprises a conveyor, a buffer mechanism, a dipping mechanism and a cleaning mechanism which are sequentially arranged, wherein the conveyor conveys the graphite bipolar plates on the circulating conveying line to the buffer mechanism, the buffer mechanism can accommodate a plurality of graphite bipolar plates, and the dipping device also comprises a clamping mechanism which is used for clamping and conveying the graphite bipolar plates;
the continuous drying box is in a tunnel type, and the circulating material conveying line penetrates through the continuous drying box;
the hot press is used for shaping the graphite bipolar plate.
6. The continuous preparation equipment for the graphite bipolar plates as claimed in claim 5, wherein the rolling forming mold comprises a buoyancy roller group and a forming roller group, and the circulating conveying line penetrates through the buoyancy roller group and the forming roller group; the buoyancy roller set is provided with a spring support, so that the buoyancy roller set can float up and down relative to the circular conveying line; the forming roller group is provided with a driving piece, the driving piece drives the forming roller group to move up and down relative to the circulating material conveying line, and the moving distance of the forming roller group is adjusted based on the floating distance of the buoyancy roller group.
7. The continuous graphite bipolar plate production equipment as claimed in claim 5, wherein the conveyor is provided with a detector, the buffer mechanism comprises a buffer wheel disc, a plurality of buffer seats and balance balls, the buffer wheel disc rotates in a circumferential direction, the buffer seats are hinged with the buffer wheel disc, the buffer seats are distributed circumferentially around the buffer wheel disc, and the balance balls are fastened with the buffer seats; the buffer mechanism is positioned in a buffer pool, and dipping solution is arranged in the buffer pool.
8. The continuous production equipment of the graphite bipolar plate as claimed in claim 7, wherein the impregnation mechanism is provided with an impregnation chamber and a plurality of first partition plates, and the first partition plates divide the impregnation chamber into a plurality of impregnation stations; the cleaning mechanism is provided with a cleaning cavity and a plurality of second partition plates, and the second partition plates divide the cleaning cavity into a plurality of cleaning stations; the clamping mechanism is located above the buffer pool, the dipping mechanism and the cleaning mechanism.
9. The continuous production equipment for the graphite bipolar plates according to claim 7, wherein a waste disposal mechanism is arranged between the dipping mechanism and the cleaning mechanism and used for disposing the graphite bipolar plates which do not meet the detection conditions of the detection member.
10. The continuous manufacturing equipment of the graphite bipolar plate as claimed in claim 1, wherein the roll forming device further comprises a pre-press roll and a guide roll, the pre-press roll and the guide roll are located in front of the roll forming die, the pre-press roll primarily levels the graphite bipolar plate, and the guide roll pulls the graphite bipolar plate into the roll forming die.
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